| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent air flowing into a sample vaporization chamber from the outside from flowing into a column to oxidize the inside of the column, when gas residual quantity in a carrier gas cylinder runs short.SOLUTION: If a user inputs a gas residual quantity determination condition item (for example, a carrier gas inflow flow rate into sample vaporization chamber 12), a determination threshold, a control object during column protective operation, and a control parameter value (for example, a target value of a gas flow rate in a flow controller 14), those information is stored in a column protective protection memory portion 42. During the execution of measurement, a carrier gas residual quantity determining portion 41 obtains, for example, a latest value of the carrier gas inflow flow rate, and compares that with the determination threshold. If it is determined that the gas residual quantity runs short, a column protective control portion 43 lowers the target value of the gas flow rate and a temperature setting value of a column oven 10. Therefore, gas pressure in the sample vaporization chamber 12 is lowered, so that the inflow of air can be avoided. Furthermore, the temperature of a column 11 is lowered, so that oxidation in the column 11 can be prevented.</p> |
